For a little fun Volevo effettuare una semplice richiesta HTTP in Rust. Ho buttato questo insieme e funziona benissimo:Cosa può causare che Rust's TcpSocket :: write() restituisca "input non valido"?
use std::io::TcpStream;
fn main() {
// This just does a "GET /" to www.stroustrup.com
println!("Establishing connection...");
let mut stream = TcpStream::connect("www.stroustrup.com:80").unwrap();
println!("Writing HTTP request...");
// unwrap() the result to make sure it succeeded, at least
let _ = stream.write(b"GET/HTTP/1.1\r\n\
Host: www.stroustrup.com\r\n\
Accept: */*\r\n\
Connection: close\r\n\r\n").unwrap();
println!("Reading response...");
let response = stream.read_to_string().unwrap();
println!("Printing response:");
println!("{}", response);
}
risposta è:
Establishing connection...
Writing HTTP request...
Reading response...
Printing response:
HTTP/1.1 200 OK
...and the rest of the long HTTP response with all the HTML as I'd expect...
Tuttavia, se cambio la richiesta di essere /C++.html
invece di /
:
use std::io::TcpStream;
fn main() {
// The only change is to "GET /C++.html" instead of "GET /"
println!("Establishing connection...");
let mut stream = TcpStream::connect("www.stroustrup.com:80").unwrap();
println!("Writing HTTP request...");
// unwrap() the result to make sure it succeeded, at least
let _ = stream.write(b"GET /C++.html HTTP/1.1\r\n\
Host: www.stroustrup.com\r\n\
Accept: */*\r\n\
Connection: close\r\n\r\n").unwrap();
println!("Reading response...");
let response = stream.read_to_string().unwrap();
println!("Printing response:");
println!("{}", response);
}
La presa rendimenti "invalid input"
:
Establishing connection...
Writing HTTP request...
Reading response...
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: invalid input', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libcore/result.rs:746
Perché la presa restituisce "invalid input"
? Il socket TCP non è a conoscenza del protocollo HTTP (e ho testato la mia richiesta con telnet e netcat: è corretto), quindi non può lamentarsi della richiesta/risposta HTTP.
Che cosa significa anche "invalid input"
qui? Perché non funziona?
La mia versione di ruggine (io sono su OS X 10.10.1):
$ rustc --version
rustc 1.0.0-nightly (ea6f65c5f 2015-01-06 19:47:08 +0000)